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Gold Ore Processing and Environmental Impacts: An Introduction
Published in Sadia Ilyas, Jae-chun Lee, Gold Metallurgy and the Environment, 2018
Most of the gold occurs as local metal, and most of the minerals are naturally connected to it. Silver often coexists with gold; when it exists with >20% silver it is named as the “electrum.” Other gold amalgams are uncommon and for the most part limited to particular metals; for instance, the two gold copper composites: Cu3Au (auricupride) and [AuCu]4 (tetra-auricupride) are considered high gold-review porphyry copper minerals (Kemess, BC, Canada). Some important ones are FeS2 (pyrite), PbS (galena), ZnS (zincblende), FeAsS (Arsenopyrite), Sb2S3 (stibnite), FeS (pyrrhotite), and CuFeS2 (chalcopyrite). Different Se minerals and Fe3O4 (magnetite) may likewise be available. In Witwatersrand, South Africa, UO2 uraninite, and to a lesser degree, thucholite (a variable blend of hydrocarbons, uraninite, and sulphides) are related to the gold bearing mineral. Uranium was recuperated as a result of gold exploitation. Carbonaceous matter always relates to certain gold minerals. Gold has partiality for Te with two known minerals, the calaverite, AuTe2 and sylvanite (Ag,Au)Te2. It occurs with Pd as porpezite, and with Rd as resinrhodite. In placer stores, it might be available as small grains or huge pieces. In specific metals knowing headstrong minerals, gold is related with sulfidic minerals to a great degree of a finely separated state. Petrovskaya (1987) worked on revealing the tendency of elements to associate with gold in minerals and ore bodies; this information is presented in Figure 1.2. Notably, the lode (vein) and placer deposits are mainly recognized auriferous deposits; however, the quartz-pebble deposits supplementing ~50% of worldwide gold production are classified as modified paleo-placer (Yannopoulos, 1991).
Characterization and Gold Extraction of Gold-bearing Dust from Carbon-bearing Gold Concentrates
Published in Mineral Processing and Extractive Metallurgy Review, 2022
Pan Cao, Shuanghua Zhang, Yajie Zheng
The result of MLA showed that the distribution rates of native gold and electrum in the dust were 86 wt.% and 14 wt.%, respectively. The results of EDS (Energy dispersive X-ray spectroscopy) showed that the average gold content of gold minerals was 90.27 wt.%. Of the gold minerals native gold, electrum and auricupride are readily cyanidable (Chryssoulis and Mullen 2016). Therefore, the types of gold minerals in the dust had no effect on cyanidation.